Malicious PDF — malware analysis report

Static analysis result for SHA-256 3652b3eb7da49450…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 12:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 856c4004e3fd58ba65f91ba65bd809d8 SHA-1: 6990ec794110097bd06338c5617ae36354ff88c8 SHA-256: 3652b3eb7da49450b4ccc097bd5e2aafd973ba752086c82c4f4c8c294a18b76b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious websites. The presence of multiple compromised CMS upload links further supports this phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=download+latest+version+of+android+kitkat PDF link annotation
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/fibufivapadofakix.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/96365718838.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/84447960126.pdfIn PDF document text
    • http://ceroki.com/image/files/xanaxezo.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/23017020957.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/11bfd0baed38c5b2419a0eff238878bf/15509837507.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/12480750762.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/weris.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/nodifejivipijipa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ce4cfbb1b428b25a68489a632648f0a0/15396100129.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb375b8aa---nomobasu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/wigajenigojoxuputilolup.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/zadapesexeberovokowaxizuf.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/3137710266.pdfIn PDF document text
    • https://penzion-palice.cz/content/dozajugadebujufu.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mamuvibamofokifotur.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/seriloxilotebinot.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/59862842513.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://polins.org/public/userfiles/file/84093540207.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/87465979697.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/wewavufovesorelulati.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/67071699831.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/81689207007.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16060 bytes
SHA-256: 83bdfef2349cb12e0b8073b0b09ef5018e4e29a2a0f79918296537a358002d37
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 10592 bytes
SHA-256: e1a1652b1f0ce05661b85afb878b6dab2579035e4283299c12b292ea69de4165